package com.study.stream;

import org.junit.Before;
import org.junit.Test;

import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

public class TestTransaction {
    List<Transaction> transactions=null;

    @Before
    public void before(){
        Trader raoul=new Trader("Raoul","Cambridge");
        Trader mario=new Trader("Mario","Milan");
        Trader alan=new Trader("Alan","Cambridge");
        Trader brian=new Trader("Brian","Cambridge");
        transactions= Arrays.asList(
                new Transaction(brian,2011,300),
                new Transaction(raoul,2012,1000),
                new Transaction(raoul,2011,400),
                new Transaction(mario,2012,710),
                new Transaction(mario,2012,700),
                new Transaction(alan,2012,950)

        );
    }

    /**
     * 1.找出2011年发生的所有交易，并按交易额排序(从低到高)
     * */
    @Test
    public void test1(){
        transactions.stream()
                .filter((x)->x.getYear()==2011)
                .sorted((x1,x2)->Integer.compare(x1.getValue(),x2.getValue()))
                .forEach(System.out::println);
    }
    /**
     * 2.交易员都在哪些不同的城市工作过
     * */
    @Test
    public void test2(){
        transactions.stream()
                .map((x)->x.getTrader().getCity())
                .distinct()
                .forEach(System.out::println);
    }
    /**
     * 3.查找所有来自剑桥的交易员，并按姓名排序
     * */
    @Test
    public void test3(){
        List<Transaction> cambridge = transactions.stream()
                .filter((x) -> x.getTrader().getCity().equals("Cambridge"))
                .sorted((x1, x2) -> x1.getTrader().getName().compareTo(x2.getTrader().getName()))
                .collect(Collectors.toList());
        cambridge.forEach(System.out::println);
    }
    /**
     * 4.返回所有交易员的姓名字符串，按字母顺序排序
     * */
    @Test
    public void test4(){
        List<String> collect = transactions.stream()
                .map((x) -> x.getTrader().getName())
                .sorted(String::compareTo)
                .collect(Collectors.toList());
        collect.forEach(System.out::println);
    }
    /**
     * 5.有没有交易员是在米兰工作的
     * */
    @Test
    public void test5(){
        boolean cambridge = transactions.stream()
                .anyMatch((x) -> x.getTrader().getCity().equals("Milan"));
        System.out.println(cambridge);
    }
    /**
     * 6.打印生活在剑桥的交易员的所有交易额
     * */
    @Test
    public void test6(){
        Optional<Integer> cambridge = transactions.stream()
                .filter((x) -> x.getTrader().getCity().equals("Cambridge"))
                .map(Transaction::getValue)
                .reduce((x, y) -> x + y);
        System.out.println(cambridge.get());
        System.out.println("==================================");
        Integer cambridge1 = transactions.stream()
                .filter((x) -> x.getTrader().getCity().equals("Cambridge"))
                .map(Transaction::getValue)
                .collect(Collectors.summingInt((x) -> x));
        System.out.println(cambridge1);

    }
    /**
     * 7.所有交易中，最高的交易额是多少
     * */
    @Test
    public void test7(){
        Optional<Integer> max = transactions.stream()
                .map(Transaction::getValue)
                .max(Integer::compareTo);
        System.out.println(max.get());
    }
    /**
     * 8.找到交易额最小的交易
     * */
    @Test
    public void test8(){
        Optional<Transaction> min = transactions.stream()
                .min((x1, x2) -> Integer.compare(x1.getValue(), x2.getValue()));
        System.out.println(min.get());
    }
}
